Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5388379ef088dc25d9a1f30b022cadfb1bde50ed820a8b7e2e5c1756eda7a5be' 
  AND token = '8SUYHJm7Pk/ye4K1VIDzB9TekSGlRKjLc0hsacZQNV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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