Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3ec034e14b8e5a906d1f539f92c0703df1ea55da2fd94be8781d58344cc4a8' 
  AND token = '3egjVx2GKHC8Tr1VeX1J8XXbFU0oSHYdNDOZOoURWKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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