Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c43ec8dfe32f38dd891e8193d24aa2de4639f55aec7efa3056b4f6e0b49367' 
  AND token = '4fQ497waHe7IZ24qb7vmoq8l0H8g0uya6dJzTGMR2KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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