Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc187217433d55b2e6eb316fd79b27e6fa2405f31bbc3ffbfaff04f88f4815da' 
  AND token = 'z8NabT/Kv3UBH3LcgPR5CmsaUUian55rOQUOhpm9KHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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