Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b5f81387dddb72570f458c8a739adb311bf843541c02dea7647154f6e44e08' 
  AND token = 'gE2ql6fJxcEyzsdRIhTK492waHS0c+rGOraecRx6PKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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