Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87c1f4e283d12d689df756b1d55c610ebef524acfd5772af1321caf64cc10ec' 
  AND token = '8qqD9Wc5ioNvze6hQyzBRSaulb56mWwscCKpspgF4uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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