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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f37a3506fb097609ef4d61d6b4fe260b9e36d4407244e3946a4a4c2031421ee3' 
  AND token = 'etLmzDzqjPdEj7RA3qr8GaZ5rwF7ta2zQucXMXubY6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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