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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ae51123bb3b3b59c2916d6b4001c48500b418f79f04ef2f30e6074e21a1f1ce' 
  AND token = '+TglIeoqL1gbzxAzemgaSMl53WF1f4lnQs6g8sQxhiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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