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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44ed3c561b48ccb7286f2e03ee93339c31553386d97f817f0772b2746711c2b7' 
  AND token = 'g4EsLbRsFC3ElY6bg0JYIvJD+uRDEo17eUZ1sjDr0dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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