Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7df1036701d586065828752c28e70ff1bf7b210dafde12b1231de4950fe879' 
  AND token = 'NaTaaNVK9r17pKgtAzDsFUfjIqTOiZ8gRBLOEin8whA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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