Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3848d20b6471298b9e286db052fdcfbc9d2ef415cc28624c4597712f92e92e6' 
  AND token = 'uNjYI2ocTxJB2P8StxdMEAiiU+Ygyd/vcEjf4stixqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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