Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab52bc535d64ee3da53f741ed515d7726f86db6f1129fa14e7f166145a58e0d' 
  AND token = '4n4oKbpjju0xpucWGeOvP5Hydz8kxCNgP4Nnc0d+K2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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