SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de79605a5eecbd0c5fc542c591427f821a1c11997c7089f6e4a498995e3b3dbd' 
  AND token = 'BGwxChP4RiqeARz2DfSvmbRXlVkDQKv5JiftEUv5b8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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