Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738c0769d6d32d72701e9fcef7fd98be1c9ca7b0481784a86957233b18cdd135' 
  AND token = 'ce4/9BZ2TR9d3iF79KKLdmufFheUbdG34UmRy41VTaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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