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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bfd8f1f3e9b30ede6857e002ce50be3cd883b22aaf57bd80a2efa56d1632bbc1' 
  AND token = 'ktJVjrJmWKkZM1C3dyFMRk3S2rILlzO0jaA/ds6Ho9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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