Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e356d689ef62fcccb4dec87d1848dc3af20ed477f150927b8550865c59d8752' 
  AND token = 'jl6e6D2mMlMi+6mebiihxs1+Il7evJd2PBYJwkOHd/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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