Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c01dd5a0aaec51943159320ccb8f1f8b30e9447a4a177781f2fb0c6bec7a8c' 
  AND token = 'dfXZ7mw0ZrtC82s8GkHTn5eaMf785l0f/jg9Pa1r2yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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