SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '57e5e0bae7d06224c956105801a1a7c6b26826637fc867656d742f2fc0c822f6' 
  AND token = 'XYCuykGy93TSzmFX9vaJp9Y08zTQbJ/Dq5Ti+0rOYi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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