Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e376c073e6cc9dbf4354514678f56fe74f885e6979d40339b0ecdba13f547cf5' 
  AND token = 'Uk01xwGgNx5rm4eNRGzFTc0PeeYNDEK/x+sJR6YbZns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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