Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '880b7b605f949fecaf9194b9ae2ee76a1ab39af5f3bcb7194bb7bb707901aa34' 
  AND token = 'VGoi6kIkRyaZCUHlIP4Ppv9QRuVeOjZ8mfQSxxIDGKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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