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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fbed94147cac681748ae17ba4a4c8ccfca98963b3991c7e46e43302baaca8dbf' 
  AND token = '7GtyQI607QNyl+dE56is9h/XB0mwKu6z7dbs5LQ81X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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