Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7431faf8848c2b811f208c590a5ea543cb90bf16d35ae3c60938cc0d472c8c1' 
  AND token = 'YSDfhn3qU2f4CeId3n3gkYlHCFDGdx4f5Y8HTidgcrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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