Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee5ffd47570148f16f7f7797d403b78442df2e966dcf66bafc60747b38482c1' 
  AND token = 'rM4Nn0uXmY9aC+YsULVfyzwhNCZ+YDswX+cmg7XmewQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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