Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf9491fafe6bb14126e7ba8ba6cde21851fcc6e7ffbd525466f90cc9b6fe578' 
  AND token = 'Ba0iCNdLrdAhYuznj13S8IvCgcI3fQAtAn/LijQIyTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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