Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3fd55f4e0bace186d1c83c967f9e31661cbc84c1c820e24d51bfd11b2e87cc' 
  AND token = 'DfblclF4dyZ3ncsEpliVaUrOjP9q+xI7BKYdI7xToL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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