SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02b2911611c8be2e8140a964aad590dceac0e8a98c10e80db28722c3513ce4a5' 
  AND token = 'f1PDQV+dk8ZHOKCtqnB/gSYR/OZ1PLbuyG+bJEQk/qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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