Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a3473b65c36527ea99bcffdeaf91e66d59be8f5e533d4bcdd35fab5cb1dcdb' 
  AND token = '2VPSuVfMe1Dxjt7pTC6J1dSqwV4Njdfekz1xvKJns1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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