Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e43e48e663cf141a849b1ae77f843508e8b6b1e3fc6889c65c7c64dc4ccee3b' 
  AND token = 'eb9e2YDI1SA7GhIq7rOgJVAQm5PIOqQZbZbs+O8Vngk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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