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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da8f86590f983ca60bff684ab7bfd3650247a935dcda117b29381789a619318e' 
  AND token = '/4tibSJfee9lkhi9wpzEmkKZ+reNupZSoRRc2JaZmqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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