Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf09c1fde1bdc466e6e103e7c6752d16d2ddfe6aa18eb66cc58b43e36e53d10' 
  AND token = 'I7ITyk1F3mDCpO3H1znqn482VlVo6F+Qun+6Hqv5pyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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