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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6437bc2b3a7d90595af9633b5c5e40d625c8fe3c719572e71c6389d9cf2c153' 
  AND token = 'a3DRL1gDE3qxgQQjpvJ5vIU9X4kXl8TB3mVU7c1UTOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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