Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5da7c5a9b5fefc6c53f880d40719d653dbbd5ba72e0f9a0d5ca928638c9b33' 
  AND token = '8/L9vlKlreFyRL/iEFkwmgKOR6nZr5Py4IK/AG9FgHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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