SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5909ac1040f097c7be1e4ce85d661163c87f83362f0fe08e638f6f285fe254f' 
  AND token = 'Iq9bdSGucoLUEgBoCvcInBBIhN2fZMlCZLIOAWKYEyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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