Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28c1db7b1f1d0e11ec129c1d7406ba145205dca07852bf2592b1db19c2aa92c' 
  AND token = '2st+d8UevbgoK7ddteID9HLCXmPz4ovxHhr4StGuPyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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