Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b4d88ae1c9bfe665ce6e988042cd9ebaec05f9fbadb0d0f7da8bd252933c57' 
  AND token = 'LCNrjG5T1sDb/31QTSwBPj0gwqx9eSrC4xK4a/Tcp7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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