Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6e4fcabfd779932f170cfbe2f2a333b24d4c0bef727307b6b856154ea7c34f' 
  AND token = 'ZdM2LCEeKsMt2ogOAI6E+ZG9Ynu30HopFrE1hG15Zrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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