Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7e3ca3b836cfb2e303f9bcd741a15723ad4a196bbff5126df74051e455c8fb' 
  AND token = 'MYGaNtC0b6ESMeJMtXDSeat/j2b/fh1EVBGy+2++OJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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