Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12540d5cbbc20d48496731f2eab64c1b26c1b446f20f8dfcf81722a065529c80' 
  AND token = '9tIJQkcZHPN5ZE7/bu9Aqq10/IvidkXtLDX0uxMUv0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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