Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0ac30b7788fd27493b0b1df9d3fa7557fab98df7693ab6d2154bd1e5d4d1bd' 
  AND token = 'gUzG86A1tcRwU67dMik8q1cCvCNMUcUWdWzUuh4NgrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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