Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d2e9b938d31940647ca590cdd2e31148f26408b06f75f796a1379f8b398ef2' 
  AND token = 'BI+6UC+LRvmprLORbzin99uLN7MO9DDqPTlUR8QGQJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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