Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9337b53c0a0d16b10206811ca71022c75dd352d1e46fef4e40a08d4fcbd902' 
  AND token = 'UZ8M4EalpWEoUPiZOZa0UoGEohEWSFguQc+FT/wFh1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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