Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1d4694e8ca0b9daf5302dc6c8d221c6e36d49a3adf94179a75b8af35aec6cf' 
  AND token = '54g7m74xPzTRkG/BB61s8GrMlORALEwqDg7i1AefHzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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