Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a8f7a637ef53c9e99e27295faf86a017ad061a119b18b7c709b5dd4992eca0' 
  AND token = 'k5cST8s0PDHmkAyvOH4nQDa7TeA2SgGWzMTk3BnvgfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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