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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3401f2f370f546e8bfbc5d674182328910df96f2a91f577389a7c71bda859de5' 
  AND token = '8IzcFrrA9sv0bI1o9wWnBI/O37civFQ2GWDr7xczXqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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