Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c087779d46c096b99f92ba11ae5c2f2878b4b4ea9cb3c06ccbbbc60de12daf' 
  AND token = '16aIRMz2Yo4cfcT1FY+R6cB/zHsGcna0WFLalWy9yAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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