Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c524ccabba157bcf4e06387814b7a38ec7ea518c1ee21854c9de4a5a76829e9' 
  AND token = 'bT/KUmQw37z5hbaLiM8smjQ1ObbZUDxs0rbReYXYug0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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