Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e9907e58b75d7ccd5e596afddf383d4f0de03187b986f1aef280e2904f0bcc' 
  AND token = 'Hb23UAQ5/c0VUymCvXjKeDtQsdwJMxAUMk+bDhlhlf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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