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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39e9301f783b9c6aab8727e298055a7417e76539a3314707136afc2e7cedd597' 
  AND token = 'NklqQReqPpeAosAS/K+8J8xz+PBL8AnaTQ4N2ptXipQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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