Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4d116538558bea3810a8d9e26eb68a34e2a093ab063d1381941095f4ec4af0' 
  AND token = 'KWT4IMyhujWhHRN0OBVSXmdlzv2UF/G7sfxr7m+fxA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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