Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ebce8871484e437870dae8ff12b56f0cc20ddef09c8ccf1949d3f27f893dab' 
  AND token = 'JwDiZDafzzyV+mclju1kW9VYuzzxTlUTF1bjZk/S5Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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