Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f0e9e31e3936447a687f7c81703f388f35d1595c686897a1a13e8a4d6967cb' 
  AND token = '6bKo4534vMQCrAZiX6WukMGoP1+ioF5NyDJHRmN5g1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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