Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e115c89e5264ad150571ef0f63afa9af03c5f0baa29476e7a4946d21f96563' 
  AND token = 'E3JIhviJp8R3j35PVuBaiGvh3OOeDfgvYxuUg85x3Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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