Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e8c6391e9fa0ced57915c0d5cd3d2b51fca94d472e0aa480f4a1958e0f445c' 
  AND token = 'wVnPFLnoUH44jfynXzvMRFqf7Yzpeap5A+2wnIVHhYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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