Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3e1de4ad0540ba1e71a31f8eda7ab7b5f754493e33826bb612a5ce7f6336008' 
  AND token = '7Ec1Oh6+dYfNVATfcfxtW5ogxyjBZDg3xYVZ77mMUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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