Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d01c83dc23be20904771e0ffe0908f704e16cec1a337ff1d5110d6428de126' 
  AND token = 'j7dyRIdp6tTaYdwVOuVij6hF+aPUwYFMOyf1bpaLJsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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