SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e14c7f64fdf1da5760629e4f4faa70692b7692880804c3b49b3f22d4b98c7b75' 
  AND token = 'ygYIucgsCRJdduK1/RH9O/GHt+xznRTWkDzNJSHvvFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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