Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba5a23c2dba936848ba02b0af873f0fd55e3b9cd55830561c8c5d570cd46184' 
  AND token = 'lqwNq8HyPUTMFT7W+AXMmtAUvJJGT+vcjWveQc5sZfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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