Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad36a74ef702ed1eee64205bbcaa5914850caef7cdc6520d1ca31cd69ed1493' 
  AND token = 'TkzTOCSjPk3plyzEqq2Iui4pQ7+Pv8tqYb6XZXM0+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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