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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '687b6a8ed0f741083f28977b6cab8a5578b4b724adadd65b84d5c2e3f1a90e40' 
  AND token = 'xQa4iXo+BdJpNHbDyRDn/kwlWfvHp0cb9LHhBaKdekA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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