SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'facc65f9134049a3897133019d97b8e85d126cd0ed7dde5370abbaa0a6778c86' 
  AND token = '/73tlAZiiki+zQEHU0/lNMwvDqZyVf+MMnwvWYymJBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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