Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1875b4184d2c2e7386c3b0e676dcc2bffccffeb24f36b330177556954af927d2' 
  AND token = '3o3oFekbfDFpQNjJkjcGiyEaEZY6SEcHh93XKD9zk18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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