Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2751ff16aca7365b6170c85ff179ce2e3abc00b2c5bf649199193b794978d58e' 
  AND token = '/rTSRjuYNzt0aiYRR45ViRNXIwHKuCg1I5CIMiBSL54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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