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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fde7ca631c2b3b3b65ed3f4bdc508503cc95a346a5eb5d01b297826d808a0937' 
  AND token = 'eNQ93Ux04dYzQCfIQm4WbdtEp7JN0IocYO3AIKv7Yuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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