Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba79af1ed16e6084c298537a8a4b776bbcebb98a70050cd38c8b4c0e3f4e2052' 
  AND token = 'h6KIrspbfNEsHkCHN/vMF1HWoFWX14jfvPl8e8Uf/4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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