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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2096f62f277d3909297df3868f457f22070c8b4fd4b6ea69ac9c1274f37a29a3' 
  AND token = '9oSF+F7YePyDAZnDDUTkNi7cE8/a3t6y/nk2NlxJ+zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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