Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97321c2642be45f4b64b1447980b3cdd356748d5a26f95fd1d0decce84f74404' 
  AND token = 'DcJYzhwQV6S7A1TYf7j4tEEStelnjAtQfzFl0TR0VD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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