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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd2fb2843d6cd309fbb345e47e8d0da6277257f4d209be07cc951d57a79adbf8' 
  AND token = 'DHq8zMmjZs5IOZdGiLa7KnffYiozK6uwNb4f4TRsONw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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