Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5d78c2c3b6a178dc30fa353c64e660e8e175b484a49a3f7f2391cdd508917f' 
  AND token = 'ZYYda4uALs4Rby5x8nsdCsXLPabOvrCxYFDiInUM5o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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