Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256baf9210bb45cc34e68ea99059f9ae0da7fc6423ca38174267faeb67e11fad' 
  AND token = 'UVR5wySPa74Daf9/2dQnV6kMJ8J2XTzsOts1ZMadFWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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