Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83d4572efe4191b78e3be8453dfcd5daff986bac51bbc3a11174c0720c15455' 
  AND token = '2UDc5JknwJQ3VIIi6aevkhfYRH0rwin5Za9csE4tB7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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