Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f9f71563dbd6b6dbe63c3f9eea71b4b09875e516da288aad5697f683f965f0' 
  AND token = 'rzyBusyLeimCby+dY9Xmbz+a+EXhHcuBQhYAkK5RFY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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