SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b5badb7dcb0f5e2524e166b9b27bf2a61ff149e421c18fa37e0d830a2baf33fd' 
  AND token = '0JroWvzNpQFMm8veywxOE/7uNnDH+H8l3Vcdr10k+KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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