Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff52bccc888114e57f33f928dbdf8d53c3c67fc75707105f718abce57fa8dfb' 
  AND token = 'jLahJMKk2+ZTgzmI/6WYt3LbEP1BfY7CxbDECeIrCFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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