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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12b21ef51b690336eef004b6e2595ac13a9c00aa77b889a9105429ae33e7b095' 
  AND token = 'zi7fvbzYqrF39umpdk8TJtI0v0G7QjVUq3/Wu5yeWi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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