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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1592dc7b72e4196c1b45c81e9fe59bc11792ff12f662bcb7eadec0ede793a431' 
  AND token = 'oLy4RAqqITYrUdIeog0cC0HMVJru/0SYI+aXvke4Mb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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