SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bbb81cf8a22dcf62dd2dfe50dc9734b9e67953166b6e273c983f10f534142c7' 
  AND token = 'bJtZpzIP8V8tsqsqyhjg8Tiq6GuzjZYWL3rrdL/pmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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