Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da321d7ea0746eb49863fa33bb457ae101a280ece39208c9193c9720a5ff946f' 
  AND token = 'nypOjUeNXpRtnL19RCdIz2otkGoVsEuPztlssP74IVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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