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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4c76702d7132df2bf838ad467607eb47da3c08eb964b3e9b3ea7850e4627fa2' 
  AND token = 'HOBull1hATzPtAxoBRhtypyDb22ZDB8BQLdy5XWHgyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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