Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28e31b2af18900dbe7cbbe3ff5ad1efbfcc95de06be92829b38ca2d9a96fd03' 
  AND token = 'ggdXQf7ywCZfJfIWi6s/afI3TAn3u3x4Vsiyzaffw9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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