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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7af5b1d608266a3cbc67486744f5597f4ecf649844d1574bd25fd4de7341083f' 
  AND token = 'MCrVjhJcBHhN9rERBYG2dVhyt0JXCU7nk53qpNrcEsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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