SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd77147b53ae363f69c8d3ace192684f1a305b9158313dd404321e30f6ad2c18b' 
  AND token = '+Rzoj0bGW63rjXUJJWC4hnlThZGbg6b6ow0X7NS8EOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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