Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d92e51e1cab8c9d32e85212baff0628200fd325e5d6f971a208c6d46d80f11' 
  AND token = 'c69qdl9gpN45Rb3C4WLxGng7OVMsfelneos2cpk3VBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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