Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278cc2cfdeb3c2e89a08f1841f92398f07bc39fce90eaa987086eb402f93bbe2' 
  AND token = '/aYKE7YSC1uD1DT+cCI/ifkTPwTTs+YodXz/U77QXI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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