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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6fbcb4a4cb025c833248cecfe0092a6f67cf9fcbe48e1987363f62425be0da9f' 
  AND token = 'esFWGsmM4WFPWltxnggWzv0zEusz8tamK8t8/g4en8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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