Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b91673217287006131374731892209ac48a141759fa96713a0854558aa1f4ce' 
  AND token = '+sDNTJWOjj6vVMMQPYovG9ekjtqDGR4Y6aWKNr2KXNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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