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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b610fb75ef020ef89dc842b61a48cbc40603c5fe59bba501919e39d31c36369' 
  AND token = 'XsUd7wXkczZ6lPAKrEX/5PH0Z8OjAzIGdXoOr5kU6BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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