Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea9ff8c168997d2bcd19e79eb7acab640292a60ecf1020349d4925bf3af582b' 
  AND token = 'RMXu2BgeOXTYG17vs14D4U3TLwE69JA64QHExL9HjT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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