Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03690c2588c149681f3aadea68457169459087dfa52d3cf90184b8d030cf4a2f' 
  AND token = 'mBbLcnnhm3NYPZZ1rDMnBnm3AFE/TQvNVdU7VUQJq0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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