Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f38c27b31d61471050c4a75d8a30ff2ad5aa8f95c4f09ddcf44615c3a549877' 
  AND token = '2t/QVWOITy1om4tYrvHNLjaZTzTkY5wtPAg5AWfhreY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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