Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c8def69d202e1faf934272394301347015ea3559ddc7b8f370d9eae5637cc10' 
  AND token = 'ibCVsdFtgkIlzdrR9352D1E4qQqPNLJmB9xUKbe935g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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