Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c266c118f4be8081471bfc8328d6692bacbbe731afe706f333f5983088e28c9' 
  AND token = 'slBi51FSYP9+3AwlkpOi8Y7Mo/i9TlTP6JB7FQgsQUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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