Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213454e184e38d4b3a13abfe9fcb39bf36815a648475a4bb584b7a2d2aaa2df5' 
  AND token = 'NZaB6FmPfhJDACjihUsTjbzSFlH9g64f9GHPeNYYdgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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