Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4ff25adda0fa1b0d2dfccea6cab89b45cd0d0e900fdec941a28372b9ab57a5' 
  AND token = 'TblCjGMT/1kRRzNneFnwLZmnunRkUJclM138nIR34xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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