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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ccf7ac0ec88fcd35f734a4b3ef0db77e0b046259c35fa05c0b228e0a88e79216' 
  AND token = 'bJF38H9c33vi6+oES+14avmXB8lhcLJFRhi++hHr/YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}