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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ec6deb885ce34a8ba2a3f8739a8043f2f54bf41484efea75a6bd328cbe5356ee' 
  AND token = '/0hgPS/Hx6xSuiD6IQPEDaTYJFUmhi8DdJsE0rD6Q9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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