Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5cc8fd2707f770298a985d4ba29804da878f22709743666af28b95c1329daa' 
  AND token = 'pL339OCx2ao3aJeOGe/LmRYxEmmMhbdRdkGlhLmGl+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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