Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6389cc7d2831f12a8973017d5d95fe17cf175ea1b71ad20079af901bfaf0889d' 
  AND token = 'x6WuJlDWSxIBeF6EF20DJyQhQYb3Fd7ksJdejwPlB6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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