Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88609a11eabcaf8076e404dd94381b0c5930709a8d8b03e6779ddfefd777f7f' 
  AND token = 'ENH3HV2mN3EPlbGtMRWg6y41VYNgC+LetIlp8MqjNw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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