Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f51070066ee283ae5100c223a6a23c8105f21faa4a67dbde0f6b11a093bd708' 
  AND token = 'H2/GF61j96MGM1dlVVvYlEnL8n5AC3shlaARhMsxoOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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