Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668e9e559734729d920c0e8871194db9ab8b066de7b20b1e5af9b5adc252a324' 
  AND token = 'rD2tGxXPJyVtOvCk6Rg4+ehCcEPHrIXQ1pWyucM6Ee0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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