SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '775abbef4f97985fa71722f88020fe609cec4ab7960fe0a9b3cb395852acb362' 
  AND token = 'G+JVPcDQb9zFx82gpnj8qzxwpuu/UxR1r4JzNfU7dWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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