Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ecf7180ae6f50a3a3762fbd5182a2d567fbfcc97a8bd0b9b4e860970d1c984' 
  AND token = 'zlE9aGLh4uMEyLRaAuKbWSo6mbPBLOm3iYgi9+6lqiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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